CS1612A-FSZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1612A-FSZ is an LED Driver IC manufactured by Cirrus Logic Inc., designed for AC DC offline switching applications with step-down (buck) topology and triac dimming capability. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across a supply voltage range of 11V to 17V and is housed in a 16-SOIC package suitable for surface mount applications in lighting systems.

Substiute Parts

CS1612A-FSZ

Cirrus Logic Inc.In Stock: 1014CS1612A-FSZ Datasheet

Current PartRFQ

LNK410LG

Power IntegrationsIn Stock: 1164LNK410LG Datasheet

MFR RecommendedRFQ

LYT1603D-TL

Power IntegrationsIn Stock: 3462LYT1603D-TL Datasheet

MFR RecommendedRFQ

TPS92210DR

Texas InstrumentsIn Stock: 32942TPS92210DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CS1612A-FSZ is determined by the following critical parameters:

• Type & Topology: AC DC offline switcher with step-down (buck) topology
• Dimming Capability: Triac dimming support for lighting applications
• Number of Outputs: Single output configuration
• Mounting & Package: Surface mount compatibility
• Operating Temperature Range: -40°C to 125°C minimum
• Supply Voltage Compatibility: Parts must operate within or encompass the 11V–17V range

Three substitute parts meet these criteria with varying trade-offs in topology, supply voltage range, and internal switch configuration. The substitutes are grouped by their ability to maintain functional equivalence in triac-dimmable LED driver applications while addressing the obsolescence of the original part.

Parameter Comparison

Engineering Selection Recommendations

LYT1603D-TL (Power Integrations LYTSwitch™-1 Series)

This part maintains step-down (buck) topology matching the CS1612A-FSZ and is actively produced. It operates at 90VAC–308VAC input, providing broader supply voltage coverage. The part is RoHS compliant with MSL 1 rating, offering superior moisture handling compared to the original. Surface mount 8-SOIC packaging enables direct PCB integration. However, dimming capability is not specified in the provided parameters, requiring design verification if triac dimming is mandatory.

TPS92210DR (Texas Instruments)

This substitute provides the closest functional match with confirmed triac dimming support and active product status. Supply voltage range of 9V–20V encompasses the original 11V–17V specification. Surface mount 8-SOIC packaging maintains board-level compatibility. ROHS3 compliance and MSL 1 rating ensure modern manufacturing standards. Flyback topology differs from the original buck topology, requiring circuit redesign considerations.

LNK410LG (Power Integrations LinkSwitch®-PH Series)

This part offers triac dimming capability and active production status with extended operating temperature range (-40°C to 150°C). Internal integrated switch reduces external component count. However, through-hole 7-SSIP packaging requires PCB layout modification from the original surface mount design. Supply voltage range of 36V–725V significantly exceeds the original specification, necessitating input stage redesign. Flyback topology represents a fundamental architectural change from the original buck converter.

Frequently Asked Questions (FAQ)

Q: Can LNK410LG directly replace CS1612A-FSZ on existing PCBs?

A: No. LNK410LG uses through-hole 7-SSIP packaging versus the original 16-SOIC surface mount package. PCB layout redesign is required. Additionally, the 36V minimum supply voltage exceeds the original 11V minimum, requiring input circuit modification.

Q: Does LYT1603D-TL support triac dimming like the original part?

A: Triac dimming capability is not specified in the provided parameters for LYT1603D-TL. Design verification is necessary if triac dimming is a functional requirement.

Q: What is the primary difference between buck and flyback topologies in these substitutes?

A: Buck topology (CS1612A-FSZ, LYT1603D-TL) steps down voltage directly with continuous input current. Flyback topology (LNK410LG, TPS92210DR) uses transformer isolation with discontinuous input current. Flyback designs require different magnetics and control circuitry.

Q: Which substitute has the best compliance and reliability ratings?

A: TPS92210DR and LYT1603D-TL both carry MSL 1 (unlimited moisture sensitivity) and RoHS compliance, superior to the original CS1612A-FSZ MSL 3 rating. LNK410LG extends operating temperature to 150°C, providing additional thermal margin.

Q: Is package compatibility critical for substitution?

A: Yes. Surface mount packages (8-SOIC, 16-SOIC) require different PCB footprints than through-hole packages (7-SSIP). TPS92210DR and LYT1603D-TL maintain surface mount compatibility; LNK410LG requires complete PCB redesign.

Q: What supply voltage range should I verify for my application?

A: Confirm your circuit's input voltage range. CS1612A-FSZ operates 11V–17V. TPS92210DR covers 9V–20V (closest match). LYT1603D-TL operates 90VAC–308VAC (AC input). LNK410LG requires 36V–725V (significant redesign needed).